00466nam a22001577a 4500008004100000020001800041082001800059100002700077245005100104250000900155260004900164300001700213650002400230650002300254650003100277211113b           ||||| |||| 00| 0 eng d  a9780707747019  a623.8932bUKH  aUK Hydrographic Office  aAdmiralty list of radio signals : Vol.1-Part-1  a2020  aUnited KingdombUK Hydrographic Officec2020  axviii, 324p.  aRadio in navigation  aAids to navigation  aCipher and telegraph codes